21012374073577 has 2 divisors, whose sum is σ = 21012374073578. Its totient is φ = 21012374073576.

The previous prime is 21012374073569. The next prime is 21012374073601. The reversal of 21012374073577 is 77537047321012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13076186442201 + 7936187631376 = 3616101^2 + 2817124^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012374073577 - 2³ = 21012374073569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21012374073577.

It is not a weakly prime, because it can be changed into another prime (21012374073517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506187036788 + 10506187036789.

It is an arithmetic number, because the mean of its divisors is an integer number (10506187036789).

Almost surely, 2^{21012374073577} is an apocalyptic number.

It is an amenable number.

21012374073577 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012374073577 is an equidigital number, since it uses as much as digits as its factorization.

21012374073577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728720, while the sum is 49.

The spelling of 21012374073577 in words is "twenty-one trillion, twelve billion, three hundred seventy-four million, seventy-three thousand, five hundred seventy-seven".